Adsorption of Carbon Dioxide with Ni-MOF-74 and MWCNT Incorporated Poly Acrylonitrile Nanofibers

Amir Hossein Harandizadeh; Seyedfoad Aghamiri; Mohammad Hojjat; Marziyeh Ranjbar-Mohammadi; Mohammad Reza Talaie

doi:10.3390/nano12030412

Adsorption of Carbon Dioxide with Ni-MOF-74 and MWCNT Incorporated Poly Acrylonitrile Nanofibers

Nanomaterials (Basel). 2022 Jan 27;12(3):412. doi: 10.3390/nano12030412.

Authors

Amir Hossein Harandizadeh¹, Seyedfoad Aghamiri¹, Mohammad Hojjat¹, Marziyeh Ranjbar-Mohammadi², Mohammad Reza Talaie³

Affiliations

¹ Department of Chemical Engineering, Faculty of Engineering, University of Isfahan, Isfahan 81746-73441, Iran.
² Department of Textile, Engineering Faculty, University of Bonab, Bonab 55513-95133, Iran.
³ Chemical Engineering Department, Faculty of Chemical, Oil and Gas Engineering, Shiraz University, Molasadra St., Shiraz 84334-71946, Iran.

Abstract

Among the new adsorbent forms, nanofiber structures have attracted extra attention because of features such as high surface area, controllable properties, and fast kinetics. The objective of this study is to produce the polyacrylonitrile (PAN) electrospun nanofibers loaded with Ni-MOF-74/MWCNT to obtain maximum CO₂ adsorption. The prepared PAN/MWCNT/MOF nanofiber based on the Box-Behnken design (BBD) model suggests the CO₂ adsorption of about 1.68 mmol/g (at 25 °C and 7 bar) includes 14.61 w/v%, 1.43 w/w%, and 11.9 w/w% for PAN, MWCNT, and MOF, respectively. The results showed the effective CO₂ adsorption of about 1.65 ± 0.03 mmol/g (BET = 65 m²/g, pore volume = 0.08 cm³/g), which proves the logical outcomes of the chosen model. The prepared PAN/MWCNT/MOF nanofiber was characterized using different analyzes such as SEM, TEM, TG, XRD, FTIR, and N₂ adsorption-desorption isotherms. More MOF mass loading on the nanofiber surface via secondary growth method resulted in 2.83 mmol/g (BET = 353 m²/g, pore volume = 0.22 cm³/g, 43% MOF mass loading) and 4.35 mmol/g (BET = 493 m²/g, pore volume = 0.27 cm³/g, 65% MOF mass loading) CO₂ adsorption at 7 bar for the first and second growth cycles, respectively. This indicates that secondary growth is more effective in the MOF loading amount and, consequently, adsorption capacity compared to the MOF loading during electrospinning.

Keywords: CO2 adsorption; MWCNT; Ni-MOF-74; electrospinning; nanofiber; secondary growth.